Projectile.



il, WESNER.

PROJECTILE.

APPLICAHON fiLED SEP?. 1J, 1915.

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.serial No. 51.16%.

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presumed as the reverse of the direction of rotation to be imparted by the rifling of the gun. Figs. II and III illustrate a drill of slightly less diameter than the body 3 of the projectile but such that the tapering portion l of the latter merges therewith. My preferred type of drill is seen to b-e of the double flute type with a point formed by an elongated taper 8. I prefer also to have the outer portions of the two cutting edges 9 of' the drill point backwardly curved with reference to or in opposition to the direction of advance of the nearest flute as appears in F ig. IV. This conformation af'- fords an added clearness and has produced better results. The purpose in having the body of the projectile slightly larger than the diameter of the drill is in order to protect the rifling of the gun from the ultrahardened metal of which the drill ,is composed. -It is not necessary that the body 3 of the projectile be quite as hard as the drill. A close inspection of Fig. II discloses that one of the iutes of the drill extends a certain distance ijearwardly' along the body of the projectile at 10 in order to enable a.;

breech end portion of' one, of the lands of the rifling to occupy it. Thence such land portion begins to take hold of and impart grooves around the somewhat softer portions of the periphery of the body 3 just where such flute ends and therefore carry out as nearly as possible a harmonious cycle of rotation. In order to make this the more possible the cartridge should be inserted in the breech of the gun in a certain way such that the land of the rifiing nearest the breech will take hold or bite upon the projectile substantially in continuation of the spiral direction of the groove.

The moditication disclosed by Figs. V and VI comprises a projectile 11 having a similarly slightly tapering nose 12 in which is fashioned centrally a square hole 13 for the reception of a similarly squared shank 14 of a drill 15 tapered throughout its length. I have discovered this type ofdrill to be equally effective when an object is struck at an angle.

Figs. VII and VIII relate to a' projectile 16 having again a slightly tapered portion 17 on which a drill 18 is an integral though hardened part. Such drill is furthermore provided with a more stubby point 19 and has four instead of two utes one of which may or may not extend a given distance into the body 16.

Figs. XI and X relate to a large and heavier type of projectile wherein the body 21 of the projectile itself has a tapering nose 22 of predetermined curvature which nose is itself fluted at 23 to provide cutting edges 24 and one of' which flutes extends rearwardly at 25 into the front portion of the body 21 for similar reasons as have been earlier given.

I claim:

. be adapted to be put in relative engagement with the land of the riiing.

3. A projectile comprising a body portion having a tapered nose provided centrally with a hole, and a drill of relativelv smaller circumference separately fitted in said hole and merging with the end of "said nose, said bodv being fashioned with ajnarrow groove forming a continuation of one flute in said drill whereby the rotation ,imparted by the rifling is initiated along said groove.

4. A. projectile having a body portion adapted to take to the riding of the gun barrel, and a drill carried by said body portion, said body portion being fashioned with a groove of like twist as and merging with a flute in said drill whereby the rifling im pression imparts rotation to said body portion in lineal. cycle with said flute. i

Signed by me, this 13th day of September,

MARTIN WESNER 

